Now and again (5)

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8 5,2,5

twice

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This clue might be a double definition.

'now' is the first definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I can't see?

'again' is the second definition.
(I've seen this in another clue)

'and' acts as a link.

Can you help me to learn more?

(Other definitions for twice that I've seen before include "Double in quantity" , "Doubly" , "Two times" , "You only live -- (film)" .)

I've seen this clue in The Irish News and The Globe and Mail.

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